Tire-constructing mold



Oct. 26 1926. 1,604,450

F. A. KRUSEMARK TIRE CONSTRUGTING MOLD Filed Nov. 26, 1924 2 Sheets-Sheet l F. A. KRUSEMARK TIRE CONSTRUCTING'MOLD F1166 Nov. 26, 1924 2 sheets-s116612 n MH l c In /QO JG fwsemwif Patented Oct. 26, 1926..`

4UNITED STATES PATENT OFFICE.

FREDERIK A. KRUSEMARK, 0F AKRON, OHIO, ASSIGNOR TO LAMBERT TIRE & RB-

BER CO., 0F BARBERTON, -OHIO.,'A CORPORATION ARIZONA.

g. l Tran-CONSTRUCTING MOLD.

Application tiled November 26, 1924. ^Serla1 No. 752,407.

. l My'invention relates to the construction of combined pneumatic and cushion tires, in which the thick cushioning tread 1s pro vided with a plurality of transverse openof this invention is to make unique provision whereby said cores may be removed from the tire while the latter is firmly held by moldl sections which have shaped it.

With the foregoing in view, the invention resides in the novel subject matter hereinafter described and claimed, the description being supplemented by the accompanying drawings.

Figure 1 is a vertical transverse sectional View showing one form of mold and illustrating a partly completed tire therein.

lFigure 2 is a vertical sectional` view on line 2-2 of Fig. 1.

Figure 3 is a detail longitudinal sectional view of a portion of the tread of the completed tire.

Figures 4 and 5 are transverse sectional views showing diiierent forms of molds.

Figure 6 is a view cut in a manner indicated by the line 6-6 of Fig. 4, but showing a construction which diers from the construction illustrated yin that figure.

The mold structure illustratedl in Figs. 1 and 2 comprises one annular side member 1, an opposite vside composed of inner and outer annular sections'2 and 3 and a ring 4 between them, a pair of bead-forming rings 5, and a second ring 6 which is inset 111 a groove 7 in the inner side of the mold section 1. The n erous sections of the mold may be secu ed together in any desired manner and their interiors form a complete molding chamber for a tire. The ring 4 carries a plurality of core pins 8 which are adapted to extend transversely acrossl the treadsforming portion of this chamber, said pins having tapered ends 9 receivable in openings 10 in the ring 6. This ring is.

readily removable from the recess 7 when the mold is disassembled, and in order to permit the ring 4 to be outwardly moved from the mold sections 2 and 3, after the formation of a tire, so as to withdraw the pins 9 from said tire, the outer corner of said ring is cut away and is provided with a groove or the like 11, so that a lever 12 or other desired means may be enga ed with the ring for prying it outwardly. is construction permits the core pins to be readily removed without injury to the tire since Ehe latter is firmly held by the mold strucure.

Inconstructing a tire by the use of a mold such as that described, or other suitable apparatus, I form a carcass and an annular tread member, assemble said carcass and tread member with a quantity of green rubber betweenV them, and with a plurality of cores in engagement with said green rub-V ber, relatively move said carcass and tread member radially to crowd the green rubber around the cores., vulcanize the tread member, green rubber and carcass together, and remove the cores. i

Specifically speaking, I may first build up a carcass 13, in any desired manner. To the.,tread portion of this carcass l apply a thickness 14 'or' green rubber. The pins 8 are disposed across this thickness of green rubber, one or both of the rings 4 and 6 being vthen in engagement with said pins to hold them in properly spaced relation. I'

then apply a tread-forming band 15 of green rubber around the pins 8, leaving spaces 1-6 between the -green rubber 14 and the green rubber l5, at opposite sides of the pins 8. The tread-forming band 15 preferably includes van inelastic fabric or cord strip 17. i

The steps so far referred to may be performedbefore the'mold sections-1, 2 and 3 are applied to the tire and engaged with the rings 4 and 6, and before the mold is'completely assembledl about said tire, the usual iniiatable air daag 18 is inserted. after the mold has been assembled about the tire, the air bag is inflated and its ypressure forces the tread portion of the carcass 13 radially outward, so that' the greenV rubber Then,

14 is crowded outwardly between the'pins i completed, a lever 12 or equivalent means may be employed to pry or move the ring 4 outwardly, thus` withdrawing the core ins 8 from the tread portion of the tire,

lcaving' transverse openings through said tread portion'. This having been` done, the

rest ot the mold may be disassembled and the completed tire removed.

Instead of following the steps previously enumerated, the tread portion proper of the tire may be built around the core ring containing the pins without first engaging these pins with the tire carcass. Then, the tread portion formed on the core pins, may be placed in the mold independently ot the tire carcass, the latter being afterwards inserted into the mold, it being of course immaterial as to whether the carcassftread member and pins are inserted simultaneously or at different times. lt is also possible to first build the tread portion ot the tire on a building drum, after which it could be disengaged from thedrum and placed over the core pins, after which the procedurel would be as above outlined.

ln Fig. 4, ll have illustrated a slightly ditterent mold structure in which opposite sides of the mold, each include an inner annular section 2a, an outer annular section 3a' and a ring 4a between the two sections. rllhese rings 4a carry inwardly project-ing core pins 8a, opposed pins co-acting in forming the openings through the tire tread. rThe method of constructing the tire with this tormof mold4 is substantially the same as with the form of construction first described.

ln liig. 5, a mold is shown comprising inner and outer annular sections 2b and 3F at one side of the mold, a ring 4b between said sections, core pins 8b projecting from said ring, and a main annular side member lb. All of this construction is similar to that shown in Fig. l, but instead of using the second ring 6, to receive the tree ends of the pins 8b, l merely form openings 10b in the inner side of the mold section l".

Fig. 6 discloses a construction similar to Fig. 4, but the core-forming pins Scextend throughout the width of the mold and are carried alternate] by the opposite rings 4c which correspon to the rings 4a, the free ends ott said pins being received in sockets 10c in the inner sides of the rings.

lt will be seen that the rings 1l, 4a and 41" have Hat outeriside faces which are Hush with the dat outer faces of the adjacent mold sections when the core pins are intheir proper positions. rll`his feature insures the core pins being properly positioned when the tire molds are stacked one upon another in the usual vulcanizer.

lt will be seen from the foregoing 'that l have devised a very advantageous mold for use in constructing tires of a combined pneumatic and cushion type, having transverse openings through the cushioning tread. y

rllhe process of constructing tires as hereincorretto in set torth is claimed in my copending application No. 80,784 filed Jan. l2, 192C.

ll claim l. A tire mold comprising sections to give shape to the tire, and a core-carrying ring constituting a mold section associated with said aforementioned sections and removable therefrom to permit the withdrawal ot the cores from the tire while the latter is {irmly held by others of the mold sections.

2. A tire mold comprising sections to give shape to the tire. and a core-carrying ring associated with said sections and removable therefrom to permit the withdrawal ot the cores from the tire while the latter is lirmly held by the mold sections, said rim having tool-engaging means, the adjacent portions ot one ot the mold sections serving as a fulcrum for the tool engaged with said means.

3. A tire mold comprising a plurality of detachable mold sections, one ot the latterl being in the form oit a narrow ring positioned between two adjacent sections, an annular series of pin-like cores fixed to said ring section, the latter having on its outer portion means to be engaged by a tool fulcrumed on an adjacent mold section, whereby said ring lsection and cores may be removed trom the tire while the latter is iirmly held by the remaining mold sections.

4. A. tire mold comprising a plurality of detachable mold, sections to shape the sides and tread of a tire and including two opposed ring-like sections at the tread portion, one of the ring-like sections having fixed thereto an annular series of pin-like transverse cores to enter a corresponding series of openings in the other ring-like section when the mold is assembled, the ringsection carrying the core pins being removable from the molded tire while the latter is still irmly held by other mold sections.

5. A tire mold comprising sections to give shape to the tire, and a core-carrying ring associated withV said sections and removable therefrom to permit the withdrawal ot the cores from the tire while the latter is tirmly held by the mold sections, said ring being adapted to lie with the outer face flush with the outer tace of the mold section with which it is associated.

6. A tire mold comprising sections to give shape to the tire and a core-carrying ring having a face portion adapted to engage and form a portion of the tire surface, associated with said sections and removable therefrom to permit the withdrawal of the cores from the tire while the latter is firmly held bythe vmold sections.

In testimony whereof l have hereunto altixed my signature. i

FREDERICK A. KRUSEMARK. 

